CN106757143A - A kind of water decomposition reaction catalysis electrode and preparation method thereof - Google Patents
A kind of water decomposition reaction catalysis electrode and preparation method thereof Download PDFInfo
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- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
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- C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
- C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
- C25B11/075—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of a single catalytic element or catalytic compound
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The invention discloses a kind of water decomposition reaction catalysis electrode and preparation method thereof, the catalysis electrode is CoaZnbC3NO particle growths in metallic substrates, wherein CoaZnbC3The size of NO particulates is 1~50 μm.The present invention will contain cobalt metal organic framework compound and be grown on the film of acrylic/hydrotalcite-like nano containing cobalt based on electro-deposition and high temperature cabonization method, afterwards by being calcined carbonization treatment under inert atmosphere, then obtain catalysis electrode with acid treatment.The catalysis electrode has excellent catalysis water decomposition analysis oxygen and hydrogen evolution activity, long-time stability, repeat performance, high-performance, long-life electrode material is suitable as, for being catalyzed water decomposition clean energy resource (hydrogen).The catalysis electrode can be grown on various flexible metal basements simultaneously, such as nickel foam, nickel sheet, nichrome film, size adjustable, it is adaptable to electrode practical application and large-scale production.
Description
Technical field
The invention belongs to electrode preparation field, and in particular to water decomposition reaction catalysis electrode and preparation method thereof, the electricity
Pole can react directly as bifunctional catalyst for electrochemistry overall moisture solution.
Background technology
The mankind encounter in the road for development for pursuing the Faster, Higher, Stronger and ask on ecological, environment and the energy etc. are many
Topic, with the increasingly depleted of the maximum fossil energy of usage amount, will keep economic sustainable development, maintain the ecological balance, just
Energy problem must be thoroughly solved, renewable and clean energy resource is found.Hydrogen is directly obtained by water decomposition and oxygen is most valency
One of clean energy resource acquisition modes of value, this mode is pollution-free, recyclable regenerative, and the hydrogen gas product of acquisition is used as clean energy resource
Use, with energy storage density very high.The isolation of water generally has electrolysis and light solution, wherein, electrolysis be by
Apply certain voltage on the electrode of electrolytic cell, the precipitated oxygen on anode separates out hydrogen, net reaction (1) and two on negative electrode
Individual half-reaction (2), (3) are as follows：
2H2O+ electric energy → 2H2+O2 (1)
2H++2e-→H2(g) (2)
2H2O (l)+electric energy → 4H++O2(g)+4e- (3)
Therefore, the speed of applied voltage size and generation gas is using the important indicator of the method decomposition water.Due to water
The Gibbs free energy of decomposition is about+237kJ/mol, and the reaction spontaneous can not be carried out, it is necessary to input energy just can excite it just
To carry out.In order to reduce energy cost (reducing input energy), water decomposition reaction rate is improved, usually using catalyst.Mesh
The High-efficient Water decomposition catalyst of preceding application is generally platinum-group noble metals, such as Pt, Ru, Rh, RuO2、IrO2Deng however, Precious Metals Resources
High cost and scarcity limit its large-scale application in actual production.Therefore, exploitation inexpensively urging without noble metal
Agent has bigger practical value.Research finds that the catalyst based on transition metal Co, Ni, Fe etc. has good catalytic water
Decomposability, wherein more extensive with the research of cobalt-containing catalyst.
The compound of cobalt as water oxidation reaction (half-reaction 3) catalyst early in 20 century 70s just it has been reported that
Specifically report CoIICatalytic capability of the salt to water oxidation reaction.The polyoxometallate of subsequent cobalt, Co3O4Deng cobalt-containing catalyst
It is synthesized and reports in succession.But, the cobalt-containing catalyst for generally preparing is exist in powder form, is needed by bonding when using
Agent or carrier by its it is immobilized could be used in aqueous systems are electrolysed to electrode matrix surface, and most of cobalt compound is only in water oxygen
Good catalytic action is played in change half-reaction, it is impossible to while being catalyzed half-reaction (2) and (3) while occurring.
Document 1.Haotian Wang, Hyun-Wook Lee, Yong Deng, Zhiyi Lu, Po-Chun Hsu,
Yayuan Liu,Dingchang Lin,and Yi Cui.Bifunctional non-noble metal oxide
nanoparticle electrocatalysts through lithium-induced conversion for overall
Water splitting.Nat.Commun., 2015,6,7261. prepare presoma carbonization cobalt-based pair using electrostatic spinning technique
Function catalyst, needs 15kV high pressures, and product is powdered.When catalytic evaluation is carried out, it is necessary to be applied using adhesives such as naphthols
Overlay on glass-carbon electrode, cause powder sample well to disperse in electrode surface, active site can not fully with electricity
The problems such as solution matter is contacted, has a strong impact on catalytic performance.
Document 2.Haiyan Jin, Jing Wang, Diefeng Su, Zhongzhe Wei, Zhenfeng Pang, and
Yong Wang.In situ Cobalt-Cobalt Oxide/N-Doped Carbon Hybrids As Superior
Bifunctional Electrocatalysts for Hydrogen and Oxygen
Evolution.J.Am.Chem.Soc., 2015,137,2688-2694., the cobalt of N doping is prepared using the method for in-situ carburization
Base bifunctional catalyst, but preparation process needs multiple high temp to be carbonized, and complex operation is cumbersome, and catalyst product is still powdered.
Document 3.Xingyue Li, Zhiguo Niu, Jing Jiang, and Lunhong Ai.Cobalt
Nanoparticles Embedded in Porous N-rich Carbon as an Efficient Bifunctional
Electrocatalyst for Water Splitting.J.Mater.Chem.A, 2016,4,3204-3209, be by with
Metal organic framework compound is prepared for the bifunctional catalyst of rich nitrogen for presoma, but it is higher to produce the overpotential of hydrogen.
Document 4.Long Jiao, Yuxiao Zhou, and Hailong Jiang.Metal-organic
Framework-based CoP/reduced Graphene Oxide:High-Performance Bifunctional
Electrocatalyst for Overall Water Splitting.Chem.Sci., in 2016,7,1690-1695, introduce
The bifunctional catalyst of cobalt-based is prepared for by pyrolysis and subsequent parkerizing process, has the disadvantage that pyrolysis temperature is too high, and needed many
Individual pyrolytic process.
Therefore, the subject matter that traditional cobalt-based bifunctional catalyst is present has：Catalyst exists with pulverulence, Yi Ju
Collection, active site can not be fully contacted electrolyte solution, cause catalytic performance to decline；Catalyst need to be by bonding when using
Agent is combined with electrode, using easy to fall off in inconvenience, and catalytic process.Therefore, growth catalyst is directly designed on electrode matrix,
Can effectively expose catalytic active site, while strengthen catalyst structure stability and repeat performance, in actual environment
In application it is significant.
The content of the invention
It is an object of the invention to provide a kind of water decomposition reaction catalysis electrode and preparation method thereof, the electrode can be used as double
Function catalyst is directly used in the reaction of electrochemistry overall moisture solution.
The water decomposition reaction catalysis electrode that the present invention is provided, is CoaZnbC3NO particle growths in metallic substrates, wherein
A and b represent the content of Co atoms and Zn atoms respectively, and the scope of a is that the scope of 0.5~1, b is 0.01~0.1；CoaZnbC3NO
The size of particulate is 1~50 μm；The catalysis electrode is applied to the process that water decomposition reaction prepares hydrogen and oxygen, its mistake for producing hydrogen
Current potential is -68mV vs RHE, and the overpotential for producing oxygen is 320mV vs RHE, produces hydrogen with excellent catalysis water decomposition and produces oxygen
Performance.
The preparation method of water decomposition reaction catalysis electrode that the present invention is provided is：Growth contains cobalt on the metallic substrate first
Acrylic/hydrotalcite-like nano film, then in the nanometer film grow metal organic framework compound containing cobalt (ZIF-67), after in inert atmosphere
Lower roasting carbonization treatment, then be to obtain catalysis electrode with acid treatment.The catalyst has excellent moisture parsing oxygen and analysis simultaneously
Hydrogen performance.
The preparation method of water decomposition reaction catalysis electrode provided by the present invention, comprises the following steps that：
A. the film of acrylic/hydrotalcite-like nano containing cobalt is first grown on the metallic substrate, and the nanometer film is that the piece of acrylic/hydrotalcite-like nano containing cobalt hangs down
Directly be grown in forming film in substrate, wherein the thickness of single nanometer sheet be 20~80 nanometers, width be 200~500 nanometers；Nanometer
The thickness of film is 400 nanometers~1 micron.
The chemical formula containing cobalt houghite is：MxCoy(OH)z(A)·nH2O or CouFev(OH)w(A)·nH2O, its
Middle M represents zinc, nickel, Fe and Mn, x:Y represents that M is 1~4 with the mol ratio of cobalt ions:1, u:V represents cobalt ions and iron ion
Mol ratio be 1~4:1, n represents hydration number, and n=5~15, A represents anion, is sulfate radical, carbonate or nitrate anion
In one or two；The metallic substrates are nickel foam, nickel sheet, nichrome film, and its thickness is 0.03mm~0.15mm, face
Product is 1~100cm2.This contains cobalt acrylic/hydrotalcite-like nano membrane preparation method referring to ZL 201410177755.9.
B., soluble cobalt is dissolved in methyl alcohol the cobalt salt solution for being made into 0.01-0.1mol/L；2-methylimidazole is dissolved in
The methanol solution of 0.1-1mol/L concentration is made into methyl alcohol；The mixing of both solution is stirred vigorously into 1~20min again to be mixed
Solution；Wherein cobalt salt and the mol ratio of 2-methylimidazole is 1~10:1, the molar concentration of cobalt salt is 1~10mmol/L；Described
Soluble cobalt is Co (NO3)2·6H2O or CoSO4·7H2O。
C. the film of acrylic/hydrotalcite-like nano containing cobalt described in step A is vertically put into the mixed solution of step B, stands 10~20
Taken out after hour, cleaned 3-6 times with deionized water, dried 0.5~3 hour at 60~80 DEG C, obtain composite nanometer film；It is compound
Nanometer film is metal organic framework compound C24H30Co3N12O2Nano particle be embedded between acrylic/hydrotalcite-like nano piece network structure
Or on nanometer film, wherein C24H30Co3N12O2Granular size is 100~300nm.
D. the composite nanometer film for step C being obtained rises to 500 with 2~10 DEG C of heating rates per minute under an inert atmosphere
DEG C~600 DEG C, it is carbonized 0.5~6 hour, obtain the composite nanometer film that is carbonized.Described inert atmosphere is nitrogen or argon gas atmosphere.
E. the carbonization composite nanometer film for step D being obtained is placed in the acid solution of 0.05~0.5mol/L, soaks 1~10 point
Clock, is cleaned 3~6 times with deionized water, and taking-up is dried, acid treated to obtain catalysis electrode, and its chemical formula is CoaZnbC3NO。
The acid solution is the one kind in hydrochloric acid, sulfuric acid.
The catalysis electrode of above-mentioned preparation is directly used as the catalysis electrode of water decomposition reaction, its catalytic performance is tested, specifically
Method is as follows：Carried out in the electrolytic cell of three electrode configurations, with catalysis electrode as working electrode, saturated calomel electrode (SCE) is
Reference electrode, platinum filament is that, to electrode, electrolytic cell is single chamber or dual chamber electrolytic cell；There is provided using electrochemical workstation (CHI 660E)
Applied external voltage, electrolyte is potassium hydroxide aqueous solution, and concentration is 1mol/L；Use cyclic voltammetry (CV), linear volt
Peace method (LSV) is tested, and sweep speed is 2mV/s, and the potential that test is obtained is (to saturated calomel electrode ESCE) being converted into pair can
Potential (the E of inverse hydrogen electrodeRHE)：ERHE=ESCE+0.244+0.059×pH.In the presence of a catalyst, the overpotential of analysis oxygen is
(ERHE- 1.23) (V), the overpotential of liberation of hydrogen is (ERHE)(V).Overpotential is represented to maintain electrode reaction speed (current density)
Required additional energy, therefore overpotential is lower, represents catalytic reaction and gets over and be easy to carry out.
The present invention has following remarkable result：
(1) catalysis electrode can be grown on various flexible metal basements, such as nickel foil, nickel foam, nichrome film, titanium
Paper tinsel etc., size adjustable, it is adaptable to electrode practical application and large-scale production.
(2) there is the catalysis electrode excellent catalysis water decomposition to analyse oxygen and hydrogen evolution activity, long-time stability, repeat to make simultaneously
With performance, high-performance, long-life electrode material are suitable as, for being catalyzed water decomposition clean energy resource (hydrogen).
Brief description of the drawings：
Fig. 1：The SEM image of embodiment 1 catalysis electrode.
Fig. 2：The SEM image at high magnification of embodiment 1 catalysis electrode.
Specific embodiment
Embodiment 1
A. white vitriol 4.6010g, cobalt sulfate 2.2488g are weighed, is dissolved in 120mL deionized waters and is configured to
Mixing salt solution, and it is added thereto to 0.39mL H2O2, resulting solution is led into nitrogen 1 hour, it is transferred in single compartment electrolytic cell, its
Middle working electrode is that area is 1cm2Nickel foam, to electrode be platinum electrode, reference electrode be Ag/AgCl electrodes, connection electricity
Chem workstation, electro-deposition is carried out to the potential that foam nickel electrode applies -1V (to Ag/AgCl electrodes), is deposited 100 seconds, is terminated
After take out nickel foam, fully washed with deionized water, and in 70 DEG C of baking ovens dry 0.5 hour, obtain houghite containing cobalt and receive
Rice film.
B. by 1.436g Co (NO3)2·6H2O is made into methanol solution, 3.244g 2-methylimidazoles in being dissolved in 100mL methyl alcohol
It is dissolved in 100mL methyl alcohol and is made into methanol solution, then pours into the methanol solution of cobalt salt in the methanol solution of 2-methylimidazole, it is acute
Strong stirring 10min.The film of acrylic/hydrotalcite-like nano containing cobalt prepared by step A is vertically put into solution, is taken out after standing 20 hours, used
Deionized water is cleaned 3 times, is dried 0.5 hour at 60 DEG C, obtains composite nanometer film.
C. by the composite nanometer film obtained by step B under an argon atmosphere under rise to 580 with 5 DEG C of heating rates per minute
DEG C, it is carbonized 1 hour, obtain the composite nanometer film that is carbonized.
D. the carbonization composite nanometer film obtained by step C is placed in the hydrochloric acid solution of 0.1mol/L, is soaked 2 minutes, spent
Ionized water is cleaned 3 times, obtains catalysis electrode, and the molecular formula of the catalyst in substrate is Co0.6Zn0.05C3NO。
Catalytic performance test：5.6g potassium hydroxide is weighed, is dissolved in 100mL deionized waters and is transferred in electrolytic cell,
It is that, to electrode, saturated calomel electrode is reference electrode with platinum electrode using above-mentioned catalysis electrode as working electrode, builds three electricity
Pole electrolytic cell.Connection electrochemical workstation, from cyclic voltammetry, it is -1.5V~-1V, 0V~1V to set scanning potential range
(to saturated calomel electrode), sweep speed is 2mV/s, and voltammetric scan is circulated to above-mentioned catalysis electrode.Evaluation result：Half is anti-
2 are answered to reach 10mA/cm2Electric current needed for overpotential be -68mV (to reversible hydrogen electrode ERHE), half-reaction 3 reaches 10mA/cm2's
Overpotential needed for electric current is 320mV (to reversible hydrogen electrode ERHE).Result is listed in table 1.
Embodiment 2
A. white vitriol 4.6010g, cobalt sulfate 2.2488g are weighed, is dissolved in 120mL deionized waters and is configured to
Mixing salt solution, and it is added thereto to 0.39mL H2O2, resulting solution is led into nitrogen 1 hour, it is transferred in single compartment electrolytic cell, its
Middle working electrode is that area is 1cm2Nickel foam, to electrode be platinum electrode, reference electrode be Ag/AgCl electrodes, connection electricity
Chem workstation, electro-deposition is carried out to the potential that nickel foil electrode applies -1V (to Ag/AgCl electrodes), is deposited 100 seconds, after terminating
Nickel foam is taken out, is fully washed with deionized water, and dried 0.5 hour in 70 DEG C of baking ovens, obtain acrylic/hydrotalcite-like nano containing cobalt
Film.
B. by 1.436g Co (NO3)2·6H2O is made into methanol solution, 6.488g 2-methylimidazoles in being dissolved in 100mL methyl alcohol
It is dissolved in 100mL methyl alcohol and is made into methanol solution, then pours into the methanol solution of cobalt salt in the methanol solution of 2-methylimidazole, it is acute
Strong stirring 20min.The film of acrylic/hydrotalcite-like nano containing cobalt prepared by step A is vertically put into solution, is taken out after standing 20 hours, used
Deionized water is cleaned 3 times, is dried 0.5 hour at 60 DEG C, obtains composite nanometer film.
C. the composite nanometer film obtained by step B is risen into 560 DEG C, carbonization 1 with 5 DEG C of heating rates per minute under argon gas
Hour, obtain the composite nanometer film that is carbonized.
D. the carbonization composite nanometer film obtained by step C is placed in the hydrochloric acid solution of 0.1mol/L, is soaked 2 minutes, spent
Ionized water is cleaned 3 times, obtains catalysis electrode, and the molecular formula of the catalyst in substrate is Co0.5Zn0.05C3NO。
Catalytic performance test method is with embodiment 1.Evaluation result is shown in Table 1.
Embodiment 3
A. white vitriol 4.6010g, cobalt sulfate 2.2488g are weighed, is dissolved in 120mL deionized waters and is configured to
Mixing salt solution, and it is added thereto to 0.39mL H2O2, resulting solution is led into nitrogen 1 hour, it is transferred in single compartment electrolytic cell, its
Middle working electrode is that area is 1cm2Nickel foam, to electrode be platinum electrode, reference electrode be Ag/AgCl electrodes, connection electricity
Chem workstation, electro-deposition is carried out to the potential that nickel foil electrode applies -1V (to Ag/AgCl electrodes), is deposited 100 seconds, after terminating
Nickel foam is taken out, is fully washed with deionized water, and dried 0.5 hour in 70 DEG C of baking ovens, obtain acrylic/hydrotalcite-like nano containing cobalt
Film.
B. by 1.436g Co (NO3)2·6H2O is made into methanol solution, 3.244g 2-methylimidazoles in being dissolved in 100mL methyl alcohol
It is dissolved in 100mL methyl alcohol and is made into methanol solution, then pours into the methanol solution of cobalt salt in the methanol solution of 2-methylimidazole, it is acute
Strong stirring 15min.The film of acrylic/hydrotalcite-like nano containing cobalt prepared by step A is vertically put into solution, is taken out after standing 20 hours, used
Deionized water is cleaned 4 times, is dried 0.5 hour at 70 DEG C, obtains composite nanometer film.
C. the composite nanometer film obtained by step B is risen into 600 DEG C, carbonization 1 with 5 DEG C of heating rates per minute under argon gas
Hour, obtain the composite nanometer film that is carbonized.
D. the carbonization composite nanometer film obtained by step C is placed in the hydrochloric acid solution of 0.1mol/L, is soaked 2 minutes, spent
Ionized water is cleaned 4 times, obtains catalysis electrode, and the molecular formula of the catalyst in substrate is Co0.8Zn0.07C3NO。
Catalytic performance test method is with embodiment 1.Evaluation result is shown in Table 1.
Embodiment 4
A. white vitriol 4.6010g, cobalt sulfate 2.2488g are weighed, is dissolved in 120mL deionized waters and is configured to
Mixing salt solution, and it is added thereto to 0.39mL H2O2, resulting solution is led into nitrogen 1 hour, it is transferred in single compartment electrolytic cell, its
Middle working electrode is that area is 1cm2Nickel foam, to electrode be platinum electrode, reference electrode be Ag/AgCl electrodes, connection electricity
Chem workstation, electro-deposition is carried out to the potential that nickel foil electrode applies -1V (to Ag/AgCl electrodes), is deposited 100 seconds, after terminating
Nickel foam is taken out, is fully washed with deionized water, and dried 0.5 hour in 70 DEG C of baking ovens, obtain acrylic/hydrotalcite-like nano containing cobalt
Film.
B. by 2.872g Co (NO3)2·6H2O is made into methanol solution, 6.488g 2-methylimidazoles in being dissolved in 150mL methyl alcohol
It is dissolved in 150mL methyl alcohol and is made into methanol solution, then pours into the methanol solution of cobalt salt in the methanol solution of 2-methylimidazole, it is acute
Strong stirring 20min.The film of acrylic/hydrotalcite-like nano containing cobalt prepared by step A is vertically put into solution, is taken out after standing 20 hours, used
Deionized water is cleaned 3 times, is dried 0.5 hour at 60 DEG C, obtains composite nanometer film.
C. the composite nanometer film obtained by step B is risen into 600 DEG C, carbonization 2 with 5 DEG C of heating rates per minute under a nitrogen
Hour, obtain the composite nanometer film that is carbonized.
D. the carbonization composite nanometer film obtained by step C is placed in the hydrochloric acid solution of 0.1mol/L, is soaked 2 minutes, spent
Ionized water is cleaned 3 times, obtains catalysis electrode, and the molecular formula of the catalyst in substrate is Co0.8Zn0.04C3NO。
Catalytic performance test method is with embodiment 1.Evaluation result is shown in Table 1.
Table 1 is the contrast being worth given in the catalytic performance and document 3,4 of electrode prepared by embodiment 1,2,3,4
Table 1
The electrode prepared from table 1, the present invention, overpotential is below literature value.
Claims (4)
1. a kind of water decomposition reaction catalysis electrode, the catalysis electrode is CoaZnbC3NO particle growths in metallic substrates, wherein
A and b represent the content of Co atoms and Zn atoms respectively, and the scope of a is that the scope of 0.5~1, b is 0.01~0.1；CoaZnbC3NO
The size of particulate is 1~50 μm；The catalysis electrode is applied to the process that water decomposition reaction prepares hydrogen and oxygen, its mistake for producing hydrogen
Current potential is -68mV vs RHE, and the overpotential for producing oxygen is 320mV vs RHE.
2. a kind of method of the water decomposition reaction catalysis electrode prepared described in claim 1 is to comprise the following steps that：
A. the film of acrylic/hydrotalcite-like nano containing cobalt is first grown on the metallic substrate, and the nanometer film is that the piece of acrylic/hydrotalcite-like nano containing cobalt is vertically given birth to
Length film is formed in substrate, wherein the thickness of single nanometer sheet be 20~80 nanometers, width be 200~500 nanometers；Nanometer film
Thickness is 400 nanometers~1 micron.
B., soluble cobalt is dissolved in methyl alcohol the cobalt salt solution for being made into 0.01-0.1mol/L；2-methylimidazole is dissolved in methyl alcohol
In be made into the methanol solution of 0.1-1mol/L concentration；Both solution are mixed again be stirred vigorously 1~20min and prepare and mix molten
Liquid；Wherein cobalt salt and the mol ratio of 2-methylimidazole is 1~10:1, the molar concentration of cobalt salt is 1~10mmol/L；
C. the film of acrylic/hydrotalcite-like nano containing cobalt described in step A is vertically put into the mixed solution of step B, stands 10~20 hours
After take out, cleaned 3-6 times with deionized water, at 60~80 DEG C dry 0.5~3 hour, obtain composite nanometer film；Composite Nano
Film is metal organic framework compound C24H30Co3N12O2Nano particle be embedded between acrylic/hydrotalcite-like nano piece network structure or receive
On rice film, wherein C24H30Co3N12O2Granular size is 100~300nm；
D. the composite nanometer film for step C being obtained under an inert atmosphere with 2~10 DEG C of heating rates per minute rise to 500 DEG C~
600 DEG C, it is carbonized 0.5~6 hour, obtains the composite nanometer film that is carbonized；Described inert atmosphere is nitrogen or argon gas atmosphere：
E. the carbonization composite nanometer film for step D being obtained is placed in the acid solution of 0.05~0.5mol/L, is soaked 1~10 minute,
Cleaned with deionized water 3~6 times, taking-up is dried, acid treated to obtain catalysis electrode；During the acid solution is hydrochloric acid, sulfuric acid
One kind.
3. the preparation method of water decomposition reaction catalysis electrode according to claim 2, it is characterized in that containing described in step A
The chemical formula of cobalt houghite is：MxCoy(OH)z(A)·nH2O or CouFev(OH)w(A)·nH2O, wherein M represent zinc, nickel,
Fe and Mn, x:Y represents that M is 1~4 with the mol ratio of cobalt ions:1, u:V represent the mol ratio of cobalt ions and iron ion for 1~
4:1, n represents hydration number, and n=5~15, A represents anion, is the one kind in sulfate radical, carbonate or nitrate anion or two
Kind；The metallic substrates are nickel foam, nickel sheet, nichrome film, and its thickness is 0.03mm~0.15mm, area is 1~
100cm2。
4. the preparation method of water decomposition reaction catalysis electrode according to claim 2, it is characterized in that described in step B can
Dissolubility cobalt salt is Co (NO3)2·6H2O or CoSO4·7H2O。
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| CN113737200A (en) * | 2021-09-03 | 2021-12-03 | 兰州大学 | Water decomposition catalyst and preparation method and application thereof |
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